When we're denied coverage by an insurance company, we often walk away with our tail between our legs and accept defeat. According to WebMD, this is leaving money on the table and one of the biggest mistakes people make is not appealing insurance coverage.

When you're denied coverage for a treatment you have the right to appeal and your insurance company is required to explain why they denied coverage. Doing so often pays off, with an estimated 59 percent of appeals being decided in favor of the patient. It's easy to forget your rights in a case like this, but as WebMD points out: "If you don't fight back you're probably leaving money on the table." This can be applied to most insurance policies and it's always good to keep in mind if your insurance company doesn't cover something you feel they should. Find a few more common mistakes people make with health insurance on WebMD. Photo by Agecom Bahia.